For ten years Nicola's periods caused her so much pain she would experience uncontrollable anger and mood swings

The neo-natal nurse, from Bridgend, South Wales, discovered her uncontrollable tempers were caused by premenstrual dysphoric disorder (PMDD), a severe period pain that can cause extreme anger and irritability.

Nicola, 29, said: “In the two weeks before my period my anger was uncontrollable.

“I threw a TV remote across the room and broke our baby gate from slamming it too hard.

“I really couldn’t do anything about it when it came on.

“But as soon as my period started, I would calm down and be left to pick up the pieces.

“I’d apologise to everyone for what I had said, or how I had been. I was a monster, like Dr Jekyll and Mr Hyde.”